Evaluation Electronics of a coriolis mass flow sensor
US5648616A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1995 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Aug 14, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/849
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In the evaluation electronics of a Coriolis mass flow sensor, two preamplifiers provide output signals that are applied to a fixed gain amplifier and a variable gain amplifier. Outputs from the two gain amplifiers are applied to a difference stage having an output coupled to a changeover switch. The output of the fixed gain amplifier is also coupled to the changeover switch. A summing/integrating stage receives signals from the preamplifiers and is connected to a phase locked-loop followed by a phase measuring and phase adding stage having an output that provides first and second phase shifted signals. A first synchronous rectifier is clocked by the first phase shifted signal and has an output connected to a switch. A sequencer keeps the switch ON during an ON period and switches the changeover switch to the difference stage except during a short measurement period during which the sequencer activates a phase measurement. A second synchronous rectifier is clocked by the first phase shifted signal during the measurement period and by the second phase shifted signal during the ON period and has an output connected to an integrator. The input of a memory stage is connected the integra…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.